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libbpf: Implement generalized .BTF.ext func/line info adjustment

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Complete multi-prog sections and multi sub-prog support in libbpf by properly
adjusting .BTF.ext's line and function information. Mark exposed
btf_ext__reloc_func_info() and btf_ext__reloc_func_info() APIs as deprecated.
These APIs have simplistic assumption that all sub-programs are going to be
appended to all main BPF programs, which doesn't hold in real life. It's
unlikely there are any users of this API, as it's very libbpf
internals-specific.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200903203542.15944-6-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-09-03 13:35:33 -07:00
committed by Andrii Nakryiko
parent 448789ba27
commit 2b28b4fa4d
3 changed files with 153 additions and 84 deletions
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2
src/libbpf_common.h
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@@ -15,6 +15,8 @@
#define LIBBPF_API __attribute__((visibility("default")))
#endif
#define LIBBPF_DEPRECATED(msg) __attribute__((deprecated(msg)))
/* Helper macro to declare and initialize libbpf options struct
*
* This dance with uninitialized declaration, followed by memset to zero,